Gridded Population of the World, Version 4 (GPWv4)
Log of Changes to the Data Sets by Version

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December 2018 Release, Revision 11 (4.11)

Erroneous no data pixels were recoded as zero and extent was updated to full global extent (90 to -90) in the following gridded data sets:
	Population Count
	Population Density
	UN WPP-Adjusted Population Count
	UN WPP-Adjusted Population Density
	Data Quality Indicators
	Land and Water Area
	Basic Demographic Characteristics

NetCDF files were updated to include the following layers:
	Mean Administrative Unit Area
	Land Area
	Water Area
	Input Sex Data Level
	Input Age Data Level

The National Identifier Grid was updated in the following ways:
	Reprocessed to remove artifacts from inland water
	Two attributes were added to indicate the administrative level of the demographic characteristics input data
	Zip files were corrected to include the National Identifier Polygons shapefile

Two new classes (Total Land Pixels and Ocean Pixels) were added to the Water Mask.

Administrative level names of the Greece Administrative Unit Center Points were translated to English.

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This document was revised 18 June 2018 with the following changes to the section for the November 2017 Release:

* Syrian Arab Republic was removed from the "Country level changes" section as it was not updated for Revision 10.
* Accordingly, the number of countries in the "Country level changes" section was updated from 65 to 64.

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November 2017 Release, Revision 10 (4.10) Data Sets

New datasets:
	Basic Demographic Characteristics
		<provides global gridded estimates of population counts by age and sex for the year 2010, consistent with national censuses and population registers.>

In addition to the native 30 arc-second resolution data, the data have been aggregated to four lower resolutions to enable faster global processing and easier comparison to other data at these resolutions:
	2.5 minute
	15 minute
	30 minute
	1 degree

The data are available at all five resolutions in ASCII (text) format in addition to GeoTIFF format. The data sets available in ASCII format are:
	Population Count
	Population Density
	UN WPP-Adjusted Population Count
	UN WPP-Adjusted Population Density
	Data Quality Indicators
	Land and Water Area
	National Identifier Grid
	Basic Demographic Charateristics

The following data sets are available in netCDF format at all resolutions except 30 arc-second:
	Population Count
	Population Density
	UN WPP-Adjusted Population Count
	UN WPP-Adjusted Population Density
	Basic Demographic Charateristics

Global changes:
	The global water mask source was updated to include more recent glacier data and local water data sources for high latitude areas.
	Additional attributes have been added to the National Identifier Grid raster and polygon layers.
	Population estimates by age and sex for 2010 have been added to the attribute table of the Administrative Unit Center Points with Population Estimates.

Country level changes (64 countries):
	�land Islands (ALA): corrected data integration errors
	Angola (AGO): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Armenia (ARM): a higher resolution source was acquired and incorporated into version 4.10
	Austria (AUT): corrected data integration errors
	Benin (BEN): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Bosnia and Herzegovina (BIH): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Brazil (BRA): corrected data integration errors
	British Virgin Islands (VGB): a more recent population data source was acquired and incorporated into version 4.10
	Brunei Darussalam (BRN): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Bulgaria (BGR): corrected data integration errors
	Canada (CAN): corrected data integration errors
	C�te d'Ivoire (CIV): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Croatia (HRV): corrected data integration errors
	Cuba (CUB): corrected data integration errors
	Cyprus (CYP): a source containing demographic data was acquired and incorporated into version 4.10, replacing the previous data
	Equatorial Guinea (GNQ): a more recent population data source was acquired and incorporated into version 4.10
	Finland (FIN): corrected data integration errors
	France (FRA): lower resolution source containing demographic data was acquired and incorporated into version 4.10
	Georgia (GEO): a more recent population data source was acquired and incorporated into version 4.10
	Germany (DEU): corrected data integration errors
	Guam (GUM): corrected data integration errors
	Guernsey (GGY): a more recent population data source was acquired and incorporated into version 4.10
	Guinea (GIN): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Holy See (VCS): corrected data integration errors
	Honduras (HND): a more recent population data source was acquired and incorporated into version 4.10
	Hungary (HUN): corrected data integration errors
	Italy (ITA): a higher resolution source was acquired and incorporated into version 4.10
	Israel(ISR): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Jamaica (JAM): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source 
	Kosovo (KOS): corrected data integration errors
	Kuwait (KWT): corrected data integration errors and an official source from Statistical Office was used and incorporated into version 4.10, replacing an unofficial source
	Lao People's Democratic Republic (LAO): a higher resolution source was acquired and incorporated into version 4.10
	Saint Lucia (LCA): corrected data integration errors and the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source 
	Malawi (MWI): a more spatially accurate boundary source was acquired and incorporated into version 4.10
	Maldives (MDV): corrected data integration errors
	Montenegro (MNE): corrected data integration errors
	Morocco (MAR): a more recent population data source was acquired and incorporated into version 4.10
	Myanmar (MMR): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Northern Mariana Islands (MNP): a higher resolution source was acquired and incorporated into version 4.10
	Pakistan (PAK): a more recent population data source was acquired and incorporated into version 4.10
	Papua New Guinea (PNG): corrected data integration errors and an official source from Statistical Office was used and incorporated into version 4.10, replacing an unofficial source
	Puerto Rico (PRI): corrected data integration errors
	Paraguay (PRY): corrected data integration errors
	Philippines (PHL): corrected data integration errors
	Portugal (PRT): corrected data integration errors and a higher resolution source was acquired and incorporated into version 4.10 
	Republic of Korea (KOR): a more spatially accurate boundary source was acquired and an official source from Statistical Office was used and incorporated into version 4.10, replacing an unofficial source
	Romania (ROU): corrected data integration errors
	Russian Federation (RUS):lower resolution source for demographic variables was acquired and incorporated into version 4.10
	Saint Helena (SHN): corrected data integration errors
	Saint Vincent and the Grenadines (VCT): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	San Marino (SMR): corrected data integration errors
	Saudi Arabia (SAU): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Senegal (SEN): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Slovenia (SVN): corrected data integration errors
	Spain (ESP): corrected data integration errors
	Sri Lanka (LKA): the final version of the census was acquired and incorporated into version 4.10, replacing the preliminary source
	Swaziland (SWZ): corrected data integration errors and an official source from Statistical Office was used and incorporated into version 4.10, replacing an unofficialsource 
	Switzerland (CHE): corrected data integration errors
	The former Yugoslav Republic of Macedonia (MKD): corrected data integration errors
	Uganda (UGA): a more recent population data source was acquired and incorporated into version 4.10
	United Kingdom of Great Britain and Northern Ireland (GBR): corrected data integration errors
	United States of America (USA): corrected data integration errors
	Western Sahara (ESH): a more recent population data source was acquired and incorporated into version 4.10
	Yemen (YEM): corrected data integration errors

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June 2016 Release, Version 4.0

A prerelease of Gridded Population of the World Version 4 (GPWv4) was made available in the 4th quarter of 2015 in a "Beta" web environment. There were a number of changes to the GPWv4 collection between the Beta release and version 4.0. The changes are listed below along with information on how to obtain the Beta version of GPWv4.

New data sets:
	National Identifier Grid
		<To provide a raster representation of nation-states in GPWv4 for use in aggregating population data.>

	Data Quality Indicators Mean Administrative Unit Area
		<provides a quantitative surface that indicates the size of the input unit(s) from which population count and density grids are derived.>


Country level changes:
	Egypt (EGY): The Beta version of Egypt's administrative boundaries and population estimates were found to be inaccurate. As a result a new source was acquired and incorporated into version 4.0
	Panama (PAN): corrected data integration errors
	Poland (POL): corrected data integration errors


How to access the Beta release:

We have preserved the Beta version of the data set in a long term archive with a unique set of DOIs. 

	Beta data set DOIs:
		Population Density - http://dx.doi.org/10.7927/H46T0JKB
		UN-Adjusted Population Density - http://dx.doi.org/10.7927/H4TH8JNR
		Population Count - http://dx.doi.org/10.7927/H4BG2KXS
		UN-Adjusted Population Count - http://dx.doi.org/10.7927/H4PR7SX1
		Land and Water Area - http://dx.doi.org/10.7927/H4M043BS
		Data Quality Indicators - http://dx.doi.org/10.7927/H4QR4V2T
		Administrative Unit Center Points with Population Estimates - http://dx.doi.org/10.7927/H4VH5KS4

If you would like access to these data, or more information on either release, please email SEDAC User Services at "ciesin.info@ciesin.columbia.edu" or the GPW team at "gpw@ciesin.columbia.edu" and reference the data set DOIs listed above.


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